The Venom Stone pedistal is in an Underworld tomb(sorry, the city's name excapes me). There has to be three others to open the treasure of Hades. I have found three of them...by chance, mind you. My nephew told me he thought the Venom Stone was near Hades Castle...he couldn't remember exactly where. He has moved on to other games now since he finished this one months ago. He is truely a whiz at these things...alas, not I. Thank you for offering...hope you can find even one of them. All I know is that the Queen "flying thing" (blue) has one. She is also in Hades on the way to the Castle.